package map;

import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

public class MapDemo2 {
    public static void main(String[] args) {
        Map<String,Integer> map = new HashMap<>();
        map.put("语文", 99);
        map.put("数学", 88);
        map.put("英语", 77);
        map.put("物理", 66);
        map.put("化学", 55);
        System.out.println(map);

        Set<String> keySet = map.keySet();
        for (String key : keySet) {
            System.out.println("key:"+key);
        }

        Set<Map.Entry<String, Integer>> entrySet = map.entrySet();
        for (Map.Entry<String, Integer> e : entrySet) {
            String key = e.getKey();
            Integer value = e.getValue();
            System.out.println(key+":"+value);
        }

        Collection<Integer> values = map.values();
        for (Integer value : values) {
            System.out.println("value:"+value);
        }

        values.forEach(System.out::println);

        map.forEach((k,v)->System.out.println(k+":"+v));
    }
}
